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Fluorinated PVA/SiO2 super-hydrophobic membrane and preparation method thereof

A superhydrophobic and fluorinated technology, which is applied in the field of polymer modified synthetic membrane separation, can solve the problems that the surface of PVA film cannot form micro-nano rough structure, and chitosan is not easy to dissolve, so as to improve the mechanical strength, prevent agglomeration, improve The effect of hydrophobicity

Active Publication Date: 2020-11-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is also to provide a kind of FePVA / SiO 2 The preparation method of superhydrophobic film, chitosan is not easy to be dissolved by organic solvent, to solve SiO in the prior art 2 The technical problem that the micro-nano rough structure cannot be formed on the surface of the PVA film after coating the organic matter;

Method used

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  • Fluorinated PVA/SiO2 super-hydrophobic membrane and preparation method thereof
  • Fluorinated PVA/SiO2 super-hydrophobic membrane and preparation method thereof

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preparation example Construction

[0032] The invention provides a kind of fluorinated PVA / SiO 2 The superhydrophobic membrane and its preparation method are prepared through the following steps:

[0033] Step 1, adding an appropriate amount of SiO to the chitosan acid solution 2 , after ultrasonic treatment for 20min, chitosan / SiO 2 solution;

[0034] Step two, to chitosan / SiO 2 The solution is to drop dextran sulfate alkali solution into the bottom liquid at a certain titration rate while stirring at a rate of 300-400rpm. After the titration is completed, stir for 5 minutes. After standing for 5 hours, centrifuge at a centrifugal speed of 2000rpm for 20 minutes, and pour off the clear liquid. , and then deionized water dispersion, centrifugation twice, and finally the lower layer containing SiO 2 The nano-microspheres were freeze-dried for two days, and the samples were stored in a dry place at 4°C and protected from light until use;

[0035] Step 3: Add appropriate amount of PVA and water into a four-ne...

Embodiment 1

[0047] Add an appropriate amount of SiO with a particle size of 30nm to the chitosan formic acid solution 2 , after ultrasonic treatment for 20min, chitosan / SiO 2 solution, chitosan mass concentration 3%, SiO 2 Mass concentration 3%;

[0048] Step two, to chitosan / SiO 2 The solution is to add dextran sulfate sodium hydroxide solution dropwise at a certain titration rate to the bottom solution while stirring at a rate of 300-400rpm. After the titration is completed, stir for 5 minutes. After standing for 5 hours, centrifuge at a centrifugal speed of 2000rpm for 20 minutes, and pour it out. Clear liquid, then deionized water dispersion, centrifugation twice, and finally the lower particle size is 60nm containing SiO 2 The nano-microspheres were freeze-dried for two days, and the samples were stored in a dry place at 4°C and protected from light until use, wherein the mass concentration of dextran sulfate in the dextran sulfate sodium hydroxide solution was 4%;

[0049] Step ...

Embodiment 2

[0054] Add an appropriate amount of SiO with a particle size of 30nm in the chitosan formic acid solution 2 , after ultrasonic treatment for 20min, chitosan / SiO 2 solution, chitosan mass concentration 3%, SiO 2 Mass concentration 9%;

[0055] Step two, to chitosan / SiO 2 The solution is to add dextran sulfate sodium hydroxide solution dropwise at a certain titration rate to the bottom solution while stirring at a rate of 300-400rpm. After the titration is completed, stir for 5 minutes. After standing for 5 hours, centrifuge at a centrifugal speed of 2000rpm for 20 minutes, and pour it out. Clear liquid, then deionized water dispersion, centrifugation twice, and finally the lower layer particle size is 100nm containing SiO 2 The nano-microspheres were freeze-dried for two days, and the samples were stored in a dry place at 4°C and protected from light until use, wherein the mass concentration of dextran sulfate in dextran sulfate sodium hydroxide solution was 6%;

[0056] St...

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Abstract

The invention provides a fluorinated PVA / SiO2 super-hydrophobic membrane and a preparation method thereof. The preparation method comprises the following steps of: adding a proper amount of SiO2 intoa chitosan acid solution, and carrying out ultrasonic treatment to prepare a chitosan / SiO2 solution; dropwise adding a dextran sulfate alkali solution into the chitosan / SiO2 solution serving as a basesolution at a certain titration rate, and carrying out stirring, standing and centrifuging to freeze-dry SiO2-containing nano microspheres on the lower layer; preparing a PVA solution; and mixing theSiO2-containing nano microspheres into the PVA solution, uniformly leveling the mixed solution on a glass sheet to obtain a PVA / chitosan / SiO2 membrane, and putting the PVA / chitosan / SiO2 membrane intoan FAS ethanol solution for fluorination to obtain the fluorinated PVA / SiO2 super-hydrophobic membrane. The invention also provides a fluorinated PVA / SiO2 super-hydrophobic membrane. According to thefluorinated PVA / SiO2 super-hydrophobic membrane provided by the invention, the technical problem of poor hydrophobicity of a membrane prepared from SiO2 and PVA conventionally is solved.

Description

technical field [0001] The invention relates to the technical field of polymer modified synthetic membrane separation, in particular to a fluorinated polyvinyl alcohol / silicon dioxide (PVA / SiO 2 ) superhydrophobic membrane and preparation method thereof. Background technique [0002] Since the side chain of polyvinyl alcohol (PVA) contains a large number of hydroxyl groups, and the hydroxyl group is small in size and strong in polarity, it is easy to form hydrogen bonds, so that its permeability to hydrogen, oxygen, nitrogen, water vapor and carbon dioxide, etc. are very low. PVA not only has the advantages of low toxicity, stable chemical properties, and good biodegradability, but also has the properties of easy fiber formation, easy film formation, good wear resistance, strong antistatic property, and high toughness. These properties make it widely used in medicine. , medicine, construction, printing, wood processing and food packaging and other fields have a wide range ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/18C08J3/12C08J3/24C08L29/04C08L5/08C08K3/36
CPCC08J7/12C08J5/18C08J3/12C08J3/24C08J2329/04C08J2405/08C08J2305/08C08K3/36C08K2201/011
Inventor 杜海燕刘绍泽申迎华陈小玲邹娜
Owner TAIYUAN UNIV OF TECH
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